Thanks Chevron , I understand how it works now-presumeably Farnborough can see the assorted light traffic on their radar and act advise accordingly- if they saw any danger of conflict . I forgot about Odiham with its Chinooks thudding up and down the M3 to add to a very varied and interesting area for overflying aircraft . It was the fact it is so busy and diverse that lead me to ask in the first place .
Thnaks again